socket bind() failing in cocoa app but not in commandline tool

Question

Created Mar ’22

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Call to bind() is failing in my Cocoa app project but not in a commandline tool project (with same exact networking code).

No sandbox
Catalina (with SIP disabled, but solution will need to work on machines with SIP enabled)
App transport settings wide open (this is a client-only setting though AFAIK)
sandboxd says "deny(1) network-bind*:32323"

When I copy the code to a commandline project, it works.

1 - If the app is not sandboxed, why is there a sandbox error in the log?

2 - Is there something else I need to add to Info.plist for binding to a network port (and other related server functionality) from a Cocoa app?

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Answer 1

DTS Engineer OP

Apple

Mar ’22

It’s hard to think of any way you’d could get this error in a non-sandboxed app, so I suspect that your app is sandboxed even though you think it isn’t. To confirm this, run Activity Monitor, bring up the process list (Window > Activity Monitor), and look in the Sandbox column (you may need to enable this by control clicking on the table header).

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